Sound-amplifier for ear-phones.



CQLARRICK.

SOUND AMPLIFIER FOR EAR PHONES.

APPLICATION FILED AUG-I3Hl917.

Patented Mar. 26, .1918.

Inventor Charles Larrick y lTlZl) CHARLES LAREIGK, OF LOS ANGELES, CALIFORNIA.

SOUND-AMPLUF'IEB FOB, EAR-PHONES.

Application filed August 13, 191?.

device to e ap plied to the transmitter of an electric trumpet or ear phone which will magnify the sound delivered to the car by the ceiver.

Figure 1 is an elevation of a electric car n trumpet or car phone equipped with a sound amplifier in accordance with the principles of my invention.

Fig. 2 is an enlarged front elevation of the sound amplifier with the phone transmitter removed.

Fig. 3 is central sectional detail on the line 33 of Fig. 2.

Fig. l is an enlarged fragmentary sectional detail on the line of Fig. 2.

The ear phone or electric ear trumpet consists of the battery 1 the transmitter 9 the Wires 3, the rheostat l and the recei As shown the transmitter 2 is circular in front and rear elevation and straight or flat in side elevation or edge View, and usually a man inserts the battery 1 into the pencil pocket of his vest with the face 6 the transmitter in front. The face 6 a dish having a small perforated area at its center for admitting the sound Waves to the microphone of the transmitter. of this is usual. in Globe ear phones and the like.

My soundamglifier 7 consists of the sound collector 8., the sound concentrator 9, and the. attaching frame 10.

The sound collector 8 is pressed from sheet metal and is hemispherical and hollow. Notches 11 are cut in one edge to receive the posts 12 extending from the battery 1 to th transmitter 2.

The sound concentrator 9 is pressed. from similar sheet metal and is hemispherical and hollow and is considerably smaller than the collector 8, and has a central concentrator opening 12' and spacing legs 13 stamped from the opening. The concentrator 9 is placed in the collector 8 with the legs 13 in contact with its inner face, thereby forming the collecting chamber 14.

The attaching frame 10 includes a cylindrical casing 15 formed integral with the Specification of Letters Patent.

Patented Mar. 26, 1918.

Serial llo. 185,925.

e flange inserter. and an annular soiit rubber 'ng forms a lining for the ca Bolts 19 are inserted throi collector 8 and through the concentra l and through Web 20 extending from flange 17.

The transmitter 2 is pressed tightly in the cushioned chamber 21 Within the 1 15 against the cushioned flange 1'? c l no lamping frame. or door, 2-2 is com the edge of the casing 15 by a hinge 22o. he soft rubber lining 2a is pasted to the inner face of the clamp 22 to en ha k of the transmitter A nected o the opposite side of the clamp fron'i the hinge 23 by hinge 2", engages th catch 2? extending outwardly from the casing 15. thereby clamping the amplifier firmly to the transmitter with the face of the transmitter backwardly; so that sound will 3 the mouth 16, pass through the collecting chamber lat. through the central concentrator opening 12. and through the concentrating and m: .ifying chamber 28 then through the perforated transmitter face 3 to the microphone.

The ear phone equipped with my sound amplifier as shown and described. if used in a vest pocket will be turned with the ha I side of the transmitter in front so as to oresent the mouth 16 forwardly. The for d edge of the collector 8 surrounds a co able area and collects the sound Wav this area and transmits them through chamber l i, through the opening 12 to t chamber 2%, and through the small ')-.lf rated area 30 of the face 6.

In actual practice, I am hard of hearing and the Globe ear phone alone is only a slight help to me but since I made and applied my amplifier I can hear as readily as an average person.

Various changes may be made in the la v out and details of construction, and the ampliiier may be made to fitdiil'erent types transmitters Without departing from the spirit of my invention as set up in the following claims.

I claim:

l. A sound amplifier, comprising a hollow hemispherical shell, a second hollow hemia. and collector, a cylindrical 'g extenci 1g from the rim oil? the sound c nccn.,xator to a plane substantially flush with the ee of the collector, an annular ins d inside of and at the bottom 2- of the casing, a web extending from the an.-

nular :lange inside of the concentrator, a. soi't rubber packing ring lorlni g a lin ng for casing and the flange, and bolts 'lllSQljtQti through the collector and through the concentrator and through the web.

o. A sound amplifier comprising a hollow hemispherical sound collector having post notches in its edge, a hollow hemispherical sound concentrator mounted within the sound collector. and having a central opening, spacing legs around the opening and forming a collecting chamber between the concentrator and collector, a cylindrical casing extending from the rim of the sound concentrator to a plane substantially flush with the edge of the collector, an annular flange inserted inside of and at the bottom of the casing, a web extending from the annular flange inside of the concentrator, a soft rubber packing ring forming a lining for the casing and the flange, bolts inserted through the collector and through the con-- ccntrator and through the web, a telephone transmitter fitting tightly within the packing ring with the battery posts in the notches, and a clamping frame hinged to the casing and adapted to hold the transmitter in place.

In testimony whereof I have signed my nan'ie to this specification.

CHAS. LAB-RICK.

Goplea of this patent may be obtained for iive cents each, by addressing the "Commissioner 0! Patents,

- Washington, D. G." 

